Product size: Backpack length 29 cm, height 41 cm Water bag: 351*175 mm Color: gray, black gray, gray red Material: nylon Packing contents: 1 outdoor sports backpack 1 outdoor sports water bag 1. Comfort: Compliant Ergonomic design, adjustable waist and sternum straps, suitable for women and men, and children. The chest strap ensures it doesn't bounce when you move. Perfect for hiking, running, marathons, biking, traveling and more. A bike hydration backpack with a hydration bladder also makes a great cycling companion 2. [High-Quality Material]: Lightweight and waterproof high-density nylon, rope structure, high-quality buckles, comfortable fit, absolutely not burdening you during exercise. EVA foam padded harness and shoulder straps with ventilation channels, quick-drying material for maximum breathability and comfort. 3. Running backpack with water bag system: Bladder compartment with suspension system, compatible with 2L water bag, compliant with FDA standards. The hydration bag can be easily filled with water thanks to the extra-large screw cap. The detachable hose makes cleaning easy just rinse, empty and turn over. 4. Perfect outdoor gear: lightweight jogging backpack, unique design brings optimal comfort and freedom of movement. Thanks to the reflective elements, you'll be visible in dark environments. The women's running backpack has an insulated pocket to keep your drinks warm or cold for hours. 5. [Lightweight, splash-proof, durable]: Perfect outdoor sports gear, made of lightweight waterproof nylon material, padded shoulder straps, comfortable for long-distance running, hiking, cycling